Definition of variable

variable - adj. (used of a device) designed so that a property (as e.g. light) can be varied; liable to or capable of change; marked by diversity or difference; noun a quantity that can assume any of a set of values; a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity; something that is likely to vary; something that is subject to variation; a star that varies noticeably in brightness.